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Miller Matic 252 Slipping

08-05-2013, 03:17 PM

I have a MM 252 with a 15 foot fairly new Bernard 300 gun. The wire seems to be slipping when it encounters resistance. I checked tension and for a moment tightened it all the way up with a little more success, but I do realize that is not the solution. In addition I removed the drive wheels and removed the gun then reinstalled them. Do you have any other suggestions.
Thanks,
Nick

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What size/kind of wire? I run a MM252 all day everyday with .045 gas flux core and i had problems almost everyday. Then i got to swapping a knurled roller for a smooth one and the problem went away. You can switch rollers to suit even though they are stamped for a specific size and wire type. Read it somewhere in a Miller manual...Bob

Comment

Even though it may be a fairly new gun, it could have a kinked liner. I've seen brand new guns that got kinked right off the bat. Easy enough to pull and check out if you determine it's not a drive roll issue.

Comment

What size/kind of wire? I run a MM252 all day everyday with .045 gas flux core and i had problems almost everyday. Then i got to swapping a knurled roller for a smooth one and the problem went away. You can switch rollers to suit even though they are stamped for a specific size and wire type. Read it somewhere in a Miller manual...Bob

Hey Bob,
I am running .035 solid wire with the .035 roller. I pulled them off and reinstalled them. I will check the manual.
Thanks,
Nick

Comment

Try loosening the tension on the spool itself, if it's too tight then that could cause your problem

Very true....remember, after getting the wire feed to be reliable the only thing that is truly important is that the reel not "over run" when the drive rolls stop pulling the wire, so set the friction (tension) on the reel as loose as you can without getting over run and birds nests!

Don J
Reno, NV

Never pick a fight with an old guy. Old guys are too smart to fight and get hurt. They'll just kill you and get it over with.

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Ditto checking the liner. Try this; run the wire through the liner, do not close the rolls. Grab the wire at either end with a pair of needle nose pliers, and push back and forth through the liner. It should be very easy to feed with a straight gun. Form the cable in a loop and feel the change in force required to feed it, now screw on the front end consumables and feel the difference. Also, check the liner for size. I had tons of trouble with Bernard liners feeding 035 wire, through an 035-052 (iirc) liner. The wire would zig zag inside the liner, and I had major feeding issues for a long time before I figured it out.

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OK, didn't read all the posts, buttttt, that machine never came with a 15' gun. Some never have a problem pushing wire through it, but most do. What you HAVE TO DO is, get yourself a single knurled drive roller, of the size of wire your using. Install it and don't crank the tenstioner down much. This will save your drive motor from baking itself and reduce your stress levels. Do not install both knurled , ONLY one....